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"Completed Text: Since CERN (European Organization for Nuclear Research) there was the idea of search for multiverses and other dimensions, and the development of massive projects for search for those, despite the massive support of several CERN scientists and the possibility of massive investments, CERN took several decades to put this in practice and only in 2021 it was finally able to start with the massive project for the creation of machines for search and test multiverse hypothesis and hypothesis about other dimensions and post-physical hypothesis as well. The most exciting news is that this first project is expected to be able to collect the data on other dimensions and even on other universes and to measure their properties, which will allow to test the multiverse hypothesis and to put the question about the beginning of the multiverse. In this paper we will not discuss the CERN project for testing other dimensions, because there are already many publications on this subject (see [@Abreu:2017swn; @Abreu:2017xkn; @Abreu:2017yqg; @Abreu:2018njd] for example). Instead we will concentrate on a special property of the multiverse of the “big bang” universes, and that is so called entanglement. The main question that we want to answer in this paper is the following: can you extract the information about the “big bang” from the observable universe if it was a part of the multiverse? This question can be answered by studying the property of entanglement in the multiverse, and in this case we are going to use the concept of entanglement between universes and universes. The main goal of the paper is to find conditions on the multiverse that would imply non-observability of the “big bang” (i.e. no extraction of the information about it from the multiverse). This information is not known to the physicist, but is available only to the information encoded in the multiverse itself and is hidden from any external observer. The paper is organized as follows: In Sec. \[secconfmult\] we shortly review the definition of the multiverse. Then in Sec. \[sectbun\] we introduce the term “big bang” universe in the multiverse and examine the property of entanglement between universes and universes in the multiverse. In Sec. \[seccond\] we use these properties of the multiverse to find conditions that would imply non-observability of the big bang and in Sec. \[secconc\] we make the conclusion. Confining multiverse {#secconfmult} ==================== There are two definitions of the multiverse, and it is important to understand which one is used. In this paper we consider the multiverse as the union of all spacetime sectors in which the observable universe is a part of it. [1/2]"